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Support multiple CAPTCHAs on a single page

Replace ID selectors with classes to allow multiple CAPTCHA instances
on the same page. Modernize JavaScript to use vanilla JS methods and
ES6 syntax (cons

Support multiple CAPTCHAs on a single page

Replace ID selectors with classes to allow multiple CAPTCHA instances
on the same page. Modernize JavaScript to use vanilla JS methods and
ES6 syntax (const, arrow functions).

fixes #98

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Move IpCounter to date-based tmpdir storage with daily cleanup

IpCounter files were stored in the cache directory without cleanup,
causing inode exhaustion on busy sites. Files are now stored in
tmp

Move IpCounter to date-based tmpdir storage with daily cleanup

IpCounter files were stored in the cache directory without cleanup,
causing inode exhaustion on busy sites. Files are now stored in
tmpdir/captcha/ip/Y-m-d/ with automatic daily cleanup via indexer.

Also reorganizes FileCookie to tmpdir/captcha/cookie/Y-m-d/ for
consistency and moves timeout config loading into IpCounter constructor.

fixes #146

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added tests for IPCounter

Add exponential timeout for failed login attempts

Introduces a configurable brute-force protection mechanism that enforces
increasing wait times between login attempts. The timeout doubles with
each

Add exponential timeout for failed login attempts

Introduces a configurable brute-force protection mechanism that enforces
increasing wait times between login attempts. The timeout doubles with
each failure (e.g., 5s → 10s → 20s → ...) up to a configurable maximum.

New settings:
- logindenial: Base timeout in seconds (0 to disable)
- logindenial_max: Maximum timeout cap (default 1 hour)

The feature works independently of CAPTCHA protection - failed attempts
are tracked per IP using the existing IpCounter mechanism, and users
are shown the remaining wait time when blocked.

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Translation update (es)

Version upped

add common files

cleanup styles, use SVG icon for audio

fix image output guardian

adjust tests and fix file cookie handling

some cleanup in EasySVG

just minimal formatting adjustments

clean up action.php, remove support for deprecated forms

more cleanup for the html generation

move file cookies to class

first go at cleaning up the code

Fix utf8_strtolower() is deprecated warning (#141)

Use \dokuwiki\Utf8\PhpString::strtolower() instead

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